Frictional drive



June 17, 1930. i gqNGSBURY ET AL 1,764,211

FRI-[CTIONAL DRIVE Filed Sept; 15, 1928 Patented June 17, 1930 UNITED STATES PATENT orrice EDWARD JOSLIN KINGSBURY AND JOHN ELMER" ANDERSON, OF KEENE, NEW HAMP- SHIRE, ASSIGNORS TO KINGSBURY MACHINE TOOL CORPORATION, OF KEENE, NEW

HAMPSHIRE, A CORPORATION OF NEW HAMPSHIRE FRICTION AL DRIVE Application filed September 15, 1928. Serial No. 306,129.

This invention relates to improvements in frictional drives of the peripheral engaging t e.

One of the features of the present invention is to provide a frictional drive in which the frictional elements are removable and easily replaceable.

Another feature of the invention is the provision of frictional drive elements which are easily constructed and in which the removable frictional parts are held in position by simple pins.

The frictional drive of the present invention has been illustrated in conjunction with an automatic sensitive drilling machine, although it will be understood that this .is by way of illustration and not of limitation of the employment of the invention in the arts.

In the drawings:

Figure 1 is a side elevation of a sensitive drilling machine having a frame 10 with a spindle housing 11 at the top thereof from which the drilling spindle 5 projects, which is provided in well known manner with a chuck (not shown) to receive the drills.

Fig. 2 is a detail view of the friction wheel, on a larger scale, in section at right angles to the axis, substantially on line 2-2 of Fig. 3.

Fig. 3 is a corresponding edge view of the wheel.

In the operation of the drilling machine, a constant drive is given to a shaft 12 having its axis located in a plane at substantially right angles to the axis of the drill spindle 5, and bearing thereon a frictional wheel 27. The automatic drilling machine is likewise provided with a lever arm 29 carrying the shaft 30 of a second frictional wheel 26, which in the illustrated form is the cam wheel which serves to operate the automatic feeding device which causes an axial movement of the drilling spindle 5.

Since this part of the mechanism is not involved in the frictional drive according to the present invention, it is not described in further detail. It is preferred to secure a rod 20 in a boss 21 of the frame 10, the rod passing through an aperture in the free end of the lever 29 and receiving a coil spring 22 which, by means of washer 23 and the adjusting nut 24, will regulate the pressure with which the frictional wheel 26 is forced against the frictional wheel 27.

In Fig. 2 the frictional wheel 26 is shown in detail as provided with a peripheral channel or groove 28 to receive a plurality of 'independentwire frictional elements 31 of diameter greater than the depth of the groove -28,each of which has a rebent hook 32 at each end. In the operating position of these parts, the hooks are pushed downward into cavities 33 formed in the base ofthe groove 28, so that the outer portions of the respective elements 31 form true circles. The hooks are secured in position in the wheel 26 by means of pins 34 which are driven in with a tight fit whereby to maintain their position. In Fig. 2, one end of one of the frictional elements 31 is shown removed from its pin 34, while the other adjacent element is shown engaged over the corresponding pin 34.

In Fig. 2, the frictional wheel 26 is shown groove 28 in the periphery of the frictional wheel 26 is greater than the total width of the several wire elements 31 so that these elements are spaced apart, and this spacing may be assisted bythe proper shaping of the cavities 33 whereby to maintain the hooked ends of the elements 31 spaced one from another.

In employment, the frictional wheels 26 and 27 are provided with similar elements 31, and these elements en age with one another peripherally as shown in Fig. 1, so that limited solely to the form of execution represented and described, but that it may be modified in many ways Within the scope of the appended claims.

WVe claim:

1. In a frictional device, awheel having a peripheral groove, a plurality of frictional wire elements each having rebent hooks at the ends, said groove being deepened into a cavity to receive the said rebent hooks, and securing pins passing through the said wheel substantially parallel to the axis whereby to engage said hooks andmaintain said wire elements in position.

2. In a frictional device,a wheel having a peripheral groove therein, a plurality of frictional Wire elements having rebent hooks at the ends located in said groove, the width of the groove being greater than the total width of-the elements so that said elements are spaced apart, said groove being deepened by cavities to receive said rebent hooks, and means to secure said wire elements in position in said groove.

In testimony whereof, weaffix our signatures.

EDWARD J OSLIN KINGSBURY.

JOHN ELMER ANDERSON. 

